This is nothing more than propagation of a filthy stinking lie.
Vince Palamara has done extensive interviews and correspondence with SS agents that worked with JFK and to a man they have stated that JFK NEVER interfered with their jobs in any way.
JFK NEVER told anyone not to ride on the rear of the limo.
Don't you ever even think about repeating this outrageous lie again.
Excuse me, sir, but you were not a Secret Service agent on the White House detail. Vince Palamara was not a Secret Service agent on the White House detail.
But Gerald Blaine and Clint Hill were both Secret Service agents on the White House detail, and they wrote the book
The Kennedy Detail. They describe the events of the Tampa motorcade on November 18, 1963, including how two agents had ridden the back steps of the limousine and how JFK had objected, humorously calling them "Ivy League charlatans".
about 3 minutes into this video as 2 agents are about to mount the limo, Roberts calls them off and they are left behind at the airport, one of the agent shrugging his shoulders 3 times in astonishment.
Count the agents in the followup car. Note particularly that the right-hand running board, behind Rybka, already has two agents. In fact, when we see the followup car later in the motorcade, we can see that it is completely full: four agents on the running boards, the driver and Roberts in the front seats, two JFK aides in the jump seats, and two agents in the back seat. Where, exactly, would agent Rybka have stood when the motorcade was going too fast for him to safely cling to the limo's rear step?
The fact of the matter was explained by Blaine and Hill: Rybka was never even assigned to ride in the motorcade; he was supposed to stay at the airport and wait for its return. He was joking with his co-workers. And since Blaine and Hill know far more about this than you do, I'll go with their report, thank you very much.